Method, device, system and software product for soft value scaling with receivers in an unsynchronized network

Abstract

A method, mobile device, network device, system, and software are devised for soft value scaling with a single antenna interference cancellation (SAIC) receiver, or with an interference rejection combining (IRC) receiver, in an unsynchronized network. A signal is received having interference that is caused by a non-synchronized network. A desired power level of that signal is calculated. Then the desired power is compared to a total power of the signal, in order to identify a portion of a received burst having substantial interference. Then that portion of the received burst is weighted, to reduce its importance during decoding.

1. A method comprising:
 receiving a signal having interference, wherein the interference is caused by a non-synchronized network; 
 calculating a desired power level of the signal; 
 comparing the desired power to a total power of the signal, in order to identify at least one portion of a received burst having substantial interference; and 
 weighting said at least one portion to reduce importance of said at least one portion during decoding. 
 
     
     
       2. The method of  claim 1 , wherein the desired power level is calculated from a least square estimate of a training sequence code before whitening, or is calculated from user data after the whitening. 
     
     
       3. The method of  claim 2 , wherein the whitening is used to perform interference rejection combining. 
     
     
       4. The method of  claim 1 , wherein the total power includes power of a carrier signal, plus noise, plus interference. 
     
     
       5. The method of  claim 1 , wherein the calculating, the comparing, and the weighting are performed downstream from a front end filter and upstream from a pre-filter, wherein said pre-filter changes a channel impulse response to minimum phase, and wherein said pre-filter is upstream from an equalizer. 
     
     
       6. An apparatus comprising:
 means for calculating a desired power level of a signal having interference, wherein the interference is caused by a non-synchronized network; 
 means for comparing the desired power to a total power of the signal, in order to identify at least one portion of a received burst having substantial interference; and 
 means for weighting said at least one portion to reduce importance of said at least one portion during decoding. 
 
     
     
       7. The apparatus of  claim 6 , further comprising means for receiving the signal. 
     
     
       8. The apparatus of  claim 6 , further comprising means for receiving the signal, further comprising means for whitening, and wherein the desired power level is calculated from a least square estimate of a training sequence code upstream from the means for whitening, or is calculated from user data downstream from the means for whitening. 
     
     
       9. The apparatus of  claim 8 , further comprising means for receiving the signal, wherein the means for whitening is used to perform interference rejection combining. 
     
     
       10. The apparatus of  claim 6 , further comprising means for receiving the signal, wherein the total power includes power of a carrier signal, plus noise, plus interference. 
     
     
       11. The apparatus of  claim 6 , further comprising means for receiving the signal, wherein the means for calculating, the means for comparing, and the means for weighting are located downstream from a front end filter and upstream from a pre-filter, wherein said pre-filter changes a channel impulse response to minimum phase, and wherein said pre-filter is upstream from an equalizer. 
     
     
       12. The apparatus of  claim 6 , wherein the apparatus is a network element at a base station, or is a mobile terminal further comprising other components for wireless communication. 
     
     
       13. An apparatus comprising:
 at least one processor; and 
 at least one memory including executable codes, the at least one memory and the executable codes configured to, with the at least one processor, cause the apparatus at least to: 
 calculate a desired power level of a signal having interference, wherein the interference is caused by a non-synchronized network; 
 compare the desired power to a total power of the signal, in order to identify at least one portion of a received burst having substantial interference; and 
 weight said at least one portion to reduce importance of said at least one portion during decoding. 
 
     
     
       14. The apparatus of  claim 13 , the at least one memory and the executable codes configured to, with the at least one processor, cause the apparatus to receive the signal having interference. 
     
     
       15. The apparatus of  claim 13 , the at least one memory and the executable codes configured to, with the at least one processor, cause the apparatus to calculate the desired power level from a least square estimate of a training sequence code. 
     
     
       16. The apparatus of  claim 15 , wherein the whitening module is configured to perform interference rejection combining. 
     
     
       17. The apparatus of  claim 13 , wherein the total power includes power of a carrier signal, plus noise, plus interference. 
     
     
       18. The apparatus of  claim 13 , the at least one memory and the executable codes configured to, with the at least one processor, cause the apparatus to change a channel impulse response to a minimum phase. 
     
     
       19. A non-transitory computer readable medium having executable codes embedded therein; the codes, when executed by a processor, cause an apparatus at least to perform:
 receive a signal having interference, wherein the interference is caused by a non-synchronized network; calculating a desired power level of the signal; 
 compare the desired power to a total power of the signal, in order to identify at least one portion of a received burst having substantial interference; and 
 weight said at least one portion to reduce importance of said at least one portion during decoding. 
 
     
     
       20. The non-transitory computer readable medium of  claim 19 , configured to, with the processor, cause the apparatus to calculate the desired power level from a least square estimate of a training sequence code before whitening, or from user data after the whitening. 
     
     
       21. The non-transitory computer readable medium of  claim 20 , wherein the whitening is used to perform interference rejection combining. 
     
     
       22. The non-transitory computer readable medium of  claim 19 , wherein the total power includes power of a carrier signal, plus noise, plus interference. 
     
     
       23. The non-transitory computer readable medium of  claim 19 , configured to, with the processor, cause the apparatus to change a channel impulse response to minimum phase. 
     
     
       24. A system comprising: at least one antenna configured to receive a signal having interference, wherein the interference is caused by a non-synchronized network; first processing module configured to calculate a desired power level of the signal; second processing module configured to compare the desired power to a total power of the signal, in order to identify at least one portion of a received burst having substantial interference; and weighting module configured to weight said at least one portion to reduce importance of said at least one portion during decoding. 
     
     
       25. The system of  claim 24 , further comprising a whitening module, and wherein the desired power level is calculated from a least square estimate of a training sequence code upstream from the whitening module, or is calculated from user data downstream from the whitening module.